The 918 Spyder is Porsche's next supercar, following in the footsteps of the Carrera GT, the 911 GT1, and the 959. It's an 887-hp plug-in electric hybrid that proves performance and efficiency are not mutually exclusive. As project leader Frank-Steffan Walliser explains: "For the first time, the technical solutions support both lap time and fuel consumption."

After several laps behind the wheel and a full day investigating what makes it work, we're convinced that the 918 points the way to a bright future for sports cars despite ever-tightening fuel-economy and emissions standards. And while this $845,000 car is out of reach even for rich people, the lessons learned will make their way down to more affordable rides.

As we first noted in our ride-along at the Nürburging last year, the 918 Spyder is powered by a midmounted V-8 engine and two electric motors. Now, as the Sept. 9, 2013, production start date grows near, Porsche has newer power figures. The front motor is good for 127 hp and the rear makes 154. By itself, the 918's electric output is more than the original 911 Turbo. Add in the 608-hp gas engine and the 918 Spyder cranks out a peak 887 hp.